WO2016005152A1 - Système de recirculation des gaz d'échappement pour moteur à combustion interne et procédé pour faire fonctionner un tel système - Google Patents

Système de recirculation des gaz d'échappement pour moteur à combustion interne et procédé pour faire fonctionner un tel système Download PDF

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Publication number
WO2016005152A1
WO2016005152A1 PCT/EP2015/063491 EP2015063491W WO2016005152A1 WO 2016005152 A1 WO2016005152 A1 WO 2016005152A1 EP 2015063491 W EP2015063491 W EP 2015063491W WO 2016005152 A1 WO2016005152 A1 WO 2016005152A1
Authority
WO
WIPO (PCT)
Prior art keywords
exhaust gas
bypass
gas recirculation
line
air supply
Prior art date
Application number
PCT/EP2015/063491
Other languages
German (de)
English (en)
Inventor
Matthias Thewes
Original Assignee
Fev Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fev Gmbh filed Critical Fev Gmbh
Priority to CN201580043237.0A priority Critical patent/CN106574580A/zh
Priority to JP2017502720A priority patent/JP6611788B2/ja
Priority to DE112015003223.1T priority patent/DE112015003223A5/de
Priority to US15/325,578 priority patent/US10215086B2/en
Publication of WO2016005152A1 publication Critical patent/WO2016005152A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/16—Control of the pumps by bypassing charging air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/1015—Air intakes; Induction systems characterised by the engine type
    • F02M35/10157—Supercharged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/1015—Air intakes; Induction systems characterised by the engine type
    • F02M35/10157—Supercharged engines
    • F02M35/10163—Supercharged engines having air intakes specially adapted to selectively deliver naturally aspirated fluid or supercharged fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10275—Means to avoid a change in direction of incoming fluid, e.g. all intake ducts diverging from plenum chamber at acute angles; Check valves; Flame arrestors for backfire prevention
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • Exhaust gas recirculation system for an internal combustion engine and method for operating such an exhaust gas recirculation system
  • the invention relates to an exhaust gas recirculation system for an internal combustion engine and to a method for operating such an exhaust gas recirculation system.
  • the exhaust gas recirculation system has an air supply pipe, an exhaust pipe, an exhaust gas recirculation pipe leading from an EGR branch point in the exhaust pipe to an EGR introduction point in the air supply pipe, and a throttle valve inside the air supply pipe downstream of the EGR introduction point.
  • One requirement placed on internal combustion engines, and diesel engines in particular, is compliance with nitrogen oxide emission limits, with decreasing legal limits requiring reduction of these emissions of nitrogen oxides.
  • EGR exhaust gas recirculation
  • exhaust gas recirculation must be determined as accurately as possible, especially in transient operation, in order to be able to represent a good correlation of the nitrogen oxide emission.
  • Internal exhaust gas recirculation refers to the backflow of exhaust gas from the exhaust passage into the combustion chamber during a valve overlap phase. The level of the internal exhaust gas recirculation depends on a pressure difference between the fresh air supply and the exhaust system, on the duration of a valve overlap and on the opening cross-sections released by the valves.
  • a further known exhaust gas recirculation is the external exhaust gas recirculation.
  • Exhaust gas recirculation systems of the aforementioned type, with a low-pressure exhaust gas recirculation, are shown in DE 10 2010 025 699 A1, DE 10 2010 027 646 A1 and WO 2010/072227 A1.
  • DE 10 2010 025 699 A1 discloses a diesel engine with means for exhaust aftertreatment and means for exhaust gas recirculation.
  • a Dieselansaugstrang and an exhaust line wherein arranged in the exhaust line at least one particulate filter and this is followed by a NOx storage catalyst downstream.
  • An exhaust gas recirculation line branches off from the exhaust line and opens into the air intake line.
  • a branch for separating an exhaust gas partial flow is arranged for the exhaust gas recirculation in a housing of the NOx storage catalytic converter.
  • DE 10 2010 027 646 A1 discloses an exhaust system of an internal combustion engine, with an exhaust system and an exhaust gas recirculation, wherein the exhaust gas recirculation of the exhaust line branches off and wherein the exhaust line comprises a pipe and exhaust gas treatment agent.
  • the pipe and / or the exhaust gas treatment means are formed at least in sections such that a plurality of lines for exhaust gas is formed, wherein a first line leads a main exhaust gas flow and a second line leads to an exhaust gas recirculation branched exhaust partial stream.
  • WO 2010/072227 A1 shows an exhaust gas recirculation system for an internal combustion engine with an exhaust gas turbocharger wherein an exhaust gas recirculation line is connected on the one hand for the removal of exhaust gas to an exhaust line of the internal combustion engine and on the other hand connected to a fresh air supply of the internal combustion engine.
  • the exhaust gas recirculation line is guided via an exhaust gas compressor to increase the pressure of the recirculated exhaust gas. Due to the increased pressure of the recirculated exhaust gas flow this is advantageously better regulated. This may already be sufficient for a moderate increase in pressure.
  • the pressure level to which the recirculated exhaust gas is compressed depends essentially on how and where it is to be supplied to the fresh air supply.
  • the object of the present invention is to be able to adapt the EGR rate more quickly to changed engine load points.
  • an exhaust gas recirculation system for an internal combustion engine which has an air supply line, an exhaust line, an exhaust gas recirculation line and a throttle valve.
  • the exhaust gas recirculation line leads from a EGR branch point in the exhaust pipe to an EGR discharge point in the air supply line.
  • the throttle is located within the air supply line downstream of the EGR discharge point.
  • a lockable bypass line for fresh air is provided, which leads to a bypass discharge point in the air supply line downstream of the throttle valve.
  • the air supply line includes all components that lead intake air from an inlet opening to the internal combustion engine.
  • the exhaust pipe includes all components that direct the exhaust gas from the internal combustion engine into the surrounding atmosphere.
  • the bypass line In a stationary operation in high partial load or at full load, the bypass line remain shut off, with an adjusted EGR rate is supplied via the throttle valve of the internal combustion engine.
  • the throttle valve In a sudden load reduction, the throttle valve can be completely closed immediately and at the same time the bypass line are opened, so that the entire enriched with recirculated exhaust gas dead volume between the EGR inlet point and the throttle is no longer supplied to the internal combustion engine and thus no longer participates in the combustion process , Therefore, the EGR rate decreases very rapidly, being fed via the bypass line fresh air without recirculated exhaust gas fraction of the internal combustion engine.
  • the bypass line can be closed and at the same time the throttle are opened, the dead volume, which is already enriched with recirculated exhaust gas, can be supplied immediately to the internal combustion engine, so that the required EGR rate is reached very quickly ,
  • the bypass line may have its own air inlet, or it may branch off from the fresh air supply air line from a bypass branch point in the air supply line upstream of the EGR introduction point and lead to the bypass introduction point.
  • a check valve is disposed between the bypass branch point and the EGR introduction point and that allows a flow through the air supply line exclusively from the bypass branch point in the direction of the EGR discharge point.
  • a bypass valve is preferably provided within the bypass line.
  • a check valve is provided within the bypass line, which permits flow through the bypass line exclusively in the direction of the bypass introduction point.
  • At least one exhaust gas turbocharger is provided with a compressor and a turbine, wherein the compressor is disposed within the air supply line and the turbine within the exhaust pipe and wherein the compressor is arranged between the EGR introduction point and the throttle valve.
  • the turbine of the exhaust gas turbocharger is preferably located upstream of the EGR branch point to provide a low pressure exhaust gas recirculation system.
  • the object is further achieved by a method for operating an exhaust gas recirculation system as described above, wherein in the event of an abrupt load reduction, the throttle valve is completely closed and the bypass line is opened.
  • the bypass line is closed and the throttle opens, so that the entire enriched with recirculated exhaust gas dead volume between the EGR inlet point and the throttle is no longer supplied to the internal combustion engine and thus no longer participates in the combustion process. Therefore, the EGR rate decreases very rapidly, being fed via the bypass line fresh air without recirculated exhaust gas fraction of the internal combustion engine.
  • the idle control in idle the idle control combined over the Opening and closing of the bypass line and on the opening and closing of the throttle valve takes place.
  • the idling control takes place exclusively via the opening and closing of the bypass line with a constant throttle position, preferably a closed throttle position.
  • bypass line is not opened as long as the pressure in the bypass inlet point is higher than at the bypass branch point.
  • the throttle valve is held in a constant throttle position, preferably completely closed, and the air is supplied via the opening and closing of the bypass line.
  • Figure 1 shows a first embodiment of an exhaust gas recirculation system with a
  • Bypass line which branches off from the air supply line
  • Figure 2 shows a second embodiment of an exhaust gas recirculation system with a bypass line, which has its own air inlet.
  • FIG. 1 shows a first embodiment of an exhaust gas recirculation system with an internal combustion engine 1 with an intake manifold 2 for the supply of air, and an exhaust manifold 3 for discharging exhaust gas.
  • the suction pipe 2 is connected to an air supply line 4, which sucks fresh air via a suction port 6, which is supplied to an air filter 7.
  • the air supply line 4 continues to a compressor 8 of an exhaust gas turbocharger 9, in which the air is compressed. Downstream of the compressor 8 is a charge air cooler 10 for cooling the air heated by the compression.
  • the air supply line 4 continues to a throttle valve 1 1 for controlling the mass flow of the supplied air.
  • the air supply line 4 continues to the intake manifold 2, which can also be regarded as part of the air supply line 4.
  • the exhaust pipe 5 is connected to the exhaust manifold 3 and leads to a turbine 12 of the exhaust gas turbocharger 9, which is drive-connected via a shaft 13 for driving the compressor 8.
  • the exhaust gases are passed downstream of the turbine 12 to an exhaust aftertreatment device 14, such as a catalyst and / or a particulate filter or the like, and then exit the exhaust line 5.
  • EGR branch point 15 Downstream of the exhaust gas aftertreatment device 14 there is an EGR branch point 15, at which exhaust gas can be diverted from the exhaust gas line 5 into an EGR line 16.
  • the EGR passage 16 leads to an EGR introduction point 17 in the air supply line 4, the EGR introduction point 17 being arranged between the air filter 7 and the compressor 8.
  • an EGR cooler 18 Within the EGR passage 16, there is provided an EGR cooler 18 for cooling the exhaust gas.
  • an EGR valve 19 is provided, via which the mass flow of the recirculated exhaust gas is controllable.
  • bypass branching point 20 Between the air filter 7 and the EGR introduction point 17 there is a bypass branching point 20, at which fresh air can be diverted from the air supply line 4 into a bypass line 21.
  • a bypass valve 22 Within the bypass line 21 is a bypass valve 22 for controlling the mass flow of the fresh air through the bypass line 21.
  • the bypass line 21 continues to a bypass-introduction point 23 on the intake manifold 2, wherein the bypass-introduction point 23 is downstream of the throttle valve 1 1.
  • a first check valve 24 is provided within the bypass line 21, which opens in the direction of the bypass Abzweigstelle 20 to the bypass inlet point 23 and closes in the opposite direction.
  • a second check valve 25 is provided which is located between the bypass branch point 20 and the EGR introduction point 17 and which is located in Direction from the EGR inlet 17 to the bypass branch 20 closes.
  • the bypass line 21 may remain shut off, with a matched EGR rate over the throttle valve 1 1 of the internal combustion engine 1 is supplied.
  • the throttle valve 1 1 can be closed immediately and simultaneously the bypass line 21 are opened via the bypass valve 22, so that the entire enriched with recirculated exhaust gas dead volume between the EGR inlet 17 and the throttle valve 1 1 no longer supplied to the internal combustion engine 1 and thus no longer participates in the combustion process. Therefore, the EGR rate decreases very rapidly, being fed via the bypass line 21 fresh air without recirculated exhaust gas portion of the internal combustion engine 1.
  • bypass line 21 can be closed via the bypass valve 22 and the throttle valve 1 1 are opened at the same time, the dead volume, which is already enriched with recirculated exhaust gas, immediately the internal combustion engine 1 can be supplied, so that the required EGR Rate is reached very quickly.
  • Figure 2 shows a second embodiment of an exhaust gas recirculation system, wherein components which are identical to components of the first embodiment are provided with the same reference numerals and are described in connection with the first embodiment.
  • bypass line 21 does not branch off from the air supply line 4 but has its own intake 27 as an air inlet. Furthermore, a further air filter 26 is provided in the bypass line 21. In addition, no check valve is required in the air supply line 4.
  • the bypass line as shown, open at a bypass inlet point 23 in the air supply line 4, here in the intake manifold 2.
  • the bypass discharge point 23 may open at any point or more arbitrary locations in the air supply line 4. It is only important that the bypass line 21 opens downstream of the throttle valve 1 1 in the air supply line 4. For example, it is conceivable that the bypass line 21 between the throttle valve and the intake manifold 2 opens into the air supply line 4. It is also possible to introduce the fresh air from the bypass line 21 in each case in the intake pipes of the individual cylinders between the intake manifold 2 and the internal combustion engine 1 or respectively in the intake ports of each cylinder within the internal combustion engine. 1

Abstract

Système de recirculation des gaz d'échappement pour moteur à combustion interne (1). Ledit système de recirculation des gaz d'échappement comporte : un conduit d'amenée d'air (4), un conduit d'échappement (5), un conduit de recirculation des gaz d'échappement (16) qui mène d'un point de ramification (15) du système de recirculation des gaz d'échappement situé dans le conduit d'échappement (5) jusqu'à un point d'entrée (17) dudit système situé dans le conduit d'amenée d'air (4), et un papillon des gaz (11) situé dans le conduit d'amenée d'air (4), en aval du point d'entrée (17) du système. Un conduit de dérivation (21) pouvant être fermé, destiné à l'air frais, conduit à un point d'entrée de dérivation (23) situé dans le conduit d'amenée d'air (4), en aval du papillon des gaz (11).
PCT/EP2015/063491 2014-07-11 2015-06-16 Système de recirculation des gaz d'échappement pour moteur à combustion interne et procédé pour faire fonctionner un tel système WO2016005152A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201580043237.0A CN106574580A (zh) 2014-07-11 2015-06-16 燃烧发动机排气再循环系统及运行排气再循环系统的方法
JP2017502720A JP6611788B2 (ja) 2014-07-11 2015-06-16 内燃機関のための排ガス再循環システムおよびこのような排ガス再循環システムを作動させるための方法
DE112015003223.1T DE112015003223A5 (de) 2014-07-11 2015-06-16 Abgasrückführungssystem für eine Verbrennungskraftmaschine und Verfahren zum Betreiben eines solchen Abgasrückführungssystems
US15/325,578 US10215086B2 (en) 2014-07-11 2015-06-16 Exhaust gas recirculation system for an internal combustion engine and method for operating such an exhaust gas recirculation system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014109805.6 2014-07-11
DE102014109805.6A DE102014109805A1 (de) 2014-07-11 2014-07-11 Abgasrückführungssystem für eine Verbrennungskraftmaschine und Verfahren zum Betreiben eines solchen Abgasrückführungssystems

Publications (1)

Publication Number Publication Date
WO2016005152A1 true WO2016005152A1 (fr) 2016-01-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/063491 WO2016005152A1 (fr) 2014-07-11 2015-06-16 Système de recirculation des gaz d'échappement pour moteur à combustion interne et procédé pour faire fonctionner un tel système

Country Status (5)

Country Link
US (1) US10215086B2 (fr)
JP (1) JP6611788B2 (fr)
CN (1) CN106574580A (fr)
DE (2) DE102014109805A1 (fr)
WO (1) WO2016005152A1 (fr)

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DE102016211528A1 (de) 2016-06-27 2017-12-28 Bayerische Motoren Werke Aktiengesellschaft Verfahren und Steuereinheit zur Einstellung eines Lastpunktes eines Verbrennungsmotors im dynamischen Motorbetrieb
DE102016219320A1 (de) * 2016-10-05 2018-04-05 Bayerische Motoren Werke Aktiengesellschaft Verbrennungsmotor
CN110107394A (zh) * 2019-05-05 2019-08-09 天津大学 一种基于两级涡轮增压器的高压废气低压侧引入系统
GB2590942B (en) * 2020-01-08 2022-08-31 Perkins Engines Co Ltd Air intake system for use in an internal combustion engine
CN114294096B (zh) * 2021-11-19 2023-04-25 东风商用车有限公司 一种基于传感器的发动机用动态空气补偿及排温管理系统

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FR2392230A1 (fr) * 1977-05-26 1978-12-22 Nissan Motor Commande de porte de gaz d'echappement pour des turbines de suralimentation de moteur a combustion interne
DE19641467A1 (de) * 1996-10-09 1998-04-16 Mann & Hummel Filter Sekundärluftsystem
JP2000186629A (ja) * 1998-12-22 2000-07-04 Toyota Motor Corp 過給機を有する内燃機関
FR2985544A3 (fr) * 2012-01-11 2013-07-12 Renault Sa Procede de pilotage d'une suralimentation a deux etages de turbocompresseurs a geometrie fixe

Also Published As

Publication number Publication date
DE112015003223A5 (de) 2017-06-29
US20170138252A1 (en) 2017-05-18
US10215086B2 (en) 2019-02-26
CN106574580A (zh) 2017-04-19
DE102014109805A1 (de) 2016-01-14
JP2017524862A (ja) 2017-08-31
JP6611788B2 (ja) 2019-11-27

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